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As soon as the body of a teenage girl is discovered on the banks of the River Baztán, the body is immediately linked to a similar murder that occurred just one month before.. In the neighbouring community of Elizondo, rumours are already circulating. It's hard to tell whether this is the work of a ritualistic killer or that of the basajaun, the 'invisible guardian' of Basque folklore. Inspector Amaia Salazar is in charge of the inquiry, which takes her back to the heart of the Basque nation, where she was born and had hoped she would never have to go again. It is a site of unsolved problems and a dreadful secret from Amaia's upbringing that will come back to haunt her. In order to tackle the reality of a serial killer on the loose, Amaia must battle the demons of her past in order to overcome the superstitions of the town. However, as she becomes more immersed in the research, she begins to sense the presence of something sinister lurking in the shadows...